Combination lock for briefcases

Abstract

A combination lock for a briefcase, comprises a case body, a push button, a plurality of combination dials, a plurality of driven wheels, a sliding sheet, a positioning sheet, a sliding block, a structural body, a back cover, and a plurality of springs, wherein the combination is changeable, and the combination dials are arranged non-axially so that the lock is simple in structure, easy to operate, and small in size. This lock is especially suitable for a briefcase.

I claim: 
     
       1. A combination lock for a briefcase, comprising a case body, a push button, a plurality of combination dials, a plurality of driven wheels, a sliding sheet, a positioning sheet, a sliding block, a structural body, a back cover and a plurality of springs; when the dials are on-combination, the push button can be pushed in a direction for opening the lock and can be pushed in an opposite direction for changing combination; the combination lock is characterized in that each combination dial is a composite body consisting of a rotation wheel and a toothed wheel, wherein the diameter of the toothed wheel is not larger than that of the rotation wheel, and the dial being provided on its bottom surface with a plurality of dents; each of the driven wheels being in the form of a disc on one side of which is provided a hub disc, and on the other side of which is provided a wheel disc, wherein both of the hub disc and wheel disc are provided with a recess at the same location; each driven wheel being drivable by one of the dials when in mesh with that dial; a plurality of axles provided on the structural body, each dial being mounted on one of the axles; a plurality of raised points provided around each axle on the surface of the structural body for engagedly cooperating with the dents on the bottom surface of each dial; a spring mounted on each axle for forcing each dial to abut against the structural body; the sliding sheet being provided at its two opposite sides with two inserting tabs respectively; the push button can be pushed downwards when each inserting tab is in alignment with the corresponding recess of the hub disc; each wheel disc of the driven wheel being mounted in a corresponding circular aperture in the structural body; when each recess of the wheel disc is in alignment with the corresponding projection provided on the circumference of the circular aperture, the push button can be pushed in the opposite direction so that each driven wheel is disengaged from the corresponding dial to achieve a combination-changeable state.